Bright and single band red-emitting NaErF4:Tm,Gd-based upconversion nanophosphors (UCNPs) were successfully synthesized by the formation of a core/intermediate shell/active shell structure. The NaErF4:Tm,Gd/NaYF4:Ca,Yb/NaYF4:Nd,Yb core/shell/shell UCNPs exhibit intense red light under both 980 and 800 nm near infrared light excitations.
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| http://dx.doi.org/10.1039/c8cc09031a | DOI Listing |
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Gastric emptying of liquids after different vagotomies and pyloroplasty.
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Gastric emptying of five liquid meals which differ in their physicochemical properties have been measured in control dogs and dogs that have received a Heinecke-Mikulicz pyloroplasty alone, proximal gastric vagotomy without drainage, selective gastric vagotomy and pyloroplasty and truncal vagotomy and pyloroplasty. The first two phases of emptying have been computed by the method of least squares to obtain a logarithmic-linear pattern and are expressed as relative rates: The initial post-ingestion process is characterized by beta or the average relative rate of emptying in the first ten minutes, the basic or exponential rate as beta and the change in rate from the initial to basic pattern as deltabeta. Each measure of gastric emptying was statistically analyzed to determine specific differences in rates between the operations studied.
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